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mov instructionop code format of mov instruction is as follows replace the codes of destination register and source register with
op code format as we have seen in the section that the first byte of all the instruction is the op code microprocessors
three byte instruction the instruction which have 16 bit data address as its operand are three byte instruction they
two byte instructions in these instruction the first byte specifies the operations code and the second byte specifies the
one byte instructions one byte instruction include both the opcode operand in the same byte to identify one byte instruction
instruction size as we have seen already that each instruction has two partsopcode operation code which tells the types of
sphl load stack pointer with hl instructionthis instruction copies the contents of hl register pair the stack pointer register
xthl exchange top of the stack with hl instruction the contents of top two location of the stack are exchanged with the contents of
pop psw instruction it is similar to above pop instruction but instead of normal register pairs it uses psw as its operand
pop instructionthis instruction copies the contents of the top two locations of the stack into the specified register
push psw instruction it is similar to above push instruction but instead of normal register paris it use psw as its operand program
push instructionthis instruction copies the contents of the specified register pair into the stack the contents of
load stack pointer this instruction loads the stack pointer register with the 16 - bit data specified in the instruction the
stack operationstack is a group of memory locations which are part of the same read write memory used for storing data
rim read interrupt mask instructionthis instruction is used to read the status of interrupts and read the serial
sim set interrupt mask instructionthis instruction is used to mask unmask 8085 interrupts and send serial output data the
di disable interrupts instructionthe interrupt enable flip flop is reset and all the interrupts of 8085 microprocessors except
ei enable interrupts instruction the interrupt enable flip flop is set and all the interrupts of 8085 microprocessor are
cmc complement carry instruction this instruction complements the carry flag i e if the carry flag is 1 before the execution of
stc set carry instruction this instruction sets the carry flag to 1 the instruction format isstc flags except carry no
nop no operation instruction no operation is performed when this instruction is executed the instruction format is
hlt halt instruction the microprocessor halts the execution of the program and enters into the wait state the address and
machine control instructions instructions used to control various machine operations are kept in this
rst restart instructions restart instructions are one byte call instructions called location for each restart instruction is predefined on
for parity flag pre return on parity even and rpo return on parity odd instructionsrpe returns from the subroutine to the calling